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Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

Published online by Cambridge University Press:  24 October 2011

JOHN D. BRADSHAW ,
ALAN P. M. VAUGHAN ,
IAN L. MILLAR ,
MICHAEL J. FLOWERDEW ,
RUDOLPH A. J. TROUW ,
C. MARK FANNING  and
MARTIN J. WHITEHOUSE
JOHN D. BRADSHAW*
Affiliation:
Department of Geological Sciences, University of Canterbury, P.B. 4800, Christchurch 8140, New Zealand
ALAN P. M. VAUGHAN
Affiliation:
British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
IAN L. MILLAR
Affiliation:
NIGL, British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
MICHAEL J. FLOWERDEW
Affiliation:
British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
RUDOLPH A. J. TROUW
Affiliation:
Universidade Federal de Rio de Janeiro, Depto. de Geologia, Av. Athos da Silveira Ramos 274, 21.946-916 Rio de Janeiro, Brazil
C. MARK FANNING
Affiliation:
PRISE, Research School of Earth Sciences, The Australian National University, Mills Road, Canberra ACT 0201, Australia
MARTIN J. WHITEHOUSE
Affiliation:
Swedish Museum of Natural History, Box 50007, S-104 05 Stockholm, Sweden
*
†Author for correspondence: john.bradshaw@canterbury.ac.nz
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Abstract

Field observations from the Trinity Peninsula Group at View Point on the Antarctic Peninsula indicate that thick, southward-younging and overturned clastic sedimentary rocks, comprising unusually coarse conglomeratic lenses within a succession of fine-grained sandstone–mudstone couplets, are the deposits of debris and turbidity flows on or at the foot of a submarine slope. Three detrital zircons from the sandstone–mudstone couplets date deposition at 302 ± 3 Ma, at or shortly after the Carboniferous–Permian boundary. Conglomerates predominantly consist of quartzite and granite and contain boulders exceeding 500 mm in diameter. Zircons from granitoid clasts and a silicic volcanic clast yield U–Pb ages of 466 ± 3 Ma, 373 ± 5 Ma and 487 ± 4 Ma, respectively and have corresponding average εHft values between +0.3 and +7.6. A quartzite clast, conglomerate matrix and sandstone interbedded with the conglomerate units have broadly similar detrital zircon age distributions and Hf isotope compositions. The clast and detrital zircon ages match well with sources within Patagonia; however, the age of one granite clast and the εHf characteristics of some detrital zircons point to a lesser South Africa or Ellsworth Mountain-like contribution, and the quartzite and granite-dominated composition of the conglomerates is similar to upper Palaeozoic diamictites in the Ellsworth Mountains. Unlike detrital zircons, large conglomerate clasts limit possible transport distance, and suggest sedimentation took place on or near the edge of continental crust. Comparison with other upper Palaeozoic to Mesozoic sediments in the Antarctic Peninsula and Patagonia, including detrital zircon composition and the style of deformation, suggests deposition of the Trinity Peninsula Group in an upper plate basin on an active margin, rather than a subduction-related accretionary setting, with slow extension and rifting punctuated by short periods of compression.

Keywords

geochronologyPacific marginsedimentationglaciationzirconHf
Type
Original Articles
Information
Geological Magazine , Volume 149 , Issue 4 , July 2012 , pp. 626 - 644
Copyright
Copyright © Cambridge University Press 2011

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Bradshaw Supplementary Table

Table 1. Summary of U-Pb zircon geochronology from View Point

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